In contrast to the previous FM 357, the system firmware is now supplied on a coded memory card which
is inserted in the module and remains there during operation. There is no copy license ("runtime license")
for the FM 357-2. This means that the system firmware must be ordered for each FM 357-2 hardware.
The memory card can additionally be used to save user data for the replacement of a module without
a programming device - the previous separate memory card is no longer needed. 



More info at FM 357-2 - Sales/Delivery Release 

Hope this will helps.

Best regards